All releases of sdts++

Release Notes: Added ability to write optional ISO 8211 record identifier field. This is important in that certain legacy GIS clients use the old FIPS 123 (ISO 8211) C library, which treats that as a mandatory field, and not as a proper optional field. Please note that this behavior is toggled on by default for sio_Writer objects. Also cleaned up generated HTML file, insured that that and other documentation files are now included in the distribution and some minor bug fixes.

Release Notes: Fixed bug whereby the final unit terminator in the DDR's file title
reserved field wasn't getting written out. This means that any SDTS
modules written by earlier versions of sdts++ might not be
compliant with the ANSI SDTS specification.